package com.wsjj.yjh;

import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;

public class TransMap {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        DataStreamSource<WaterSensor> source = env.fromElements(
                new WaterSensor("sensor_1", 1L, 1),
                new WaterSensor("sensor_2", 2L, 2),
                new WaterSensor("sensor_3", 3L, 3)
        );
//      方式一：传入匿名类，实现MapFunction
        source.map(new MapFunction<WaterSensor, String>() {
            @Override
            public String map(WaterSensor value) throws Exception {
                return value.id;
            }
        }).print();
//      方式二：传入MapFunction的实现类
        source.map(new UserMap()).print();
        env.execute();
    }
    private static class UserMap implements MapFunction<WaterSensor,String>{
        @Override
        public String map(WaterSensor value) throws Exception {
            return value.id;
        }
    }
}
